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Note 6 - Allowance for Loan Losses - Changes in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance, excluding PCI                      
Beginning balance       $ 17,948       $ 20,233 $ 17,948 $ 20,233  
Provision (Recovery) for loan losses                 2,771 1,254  
Charge-offs                 (2,943) (5,176)  
Recoveries                 1,500 1,637  
Net recoveries (charge-offs)                 (1,443) (3,539)  
Ending balance $ 19,276       $ 17,948       19,276 17,948 $ 20,233
PCI allowance                      
Beginning balance       17,948       20,233 17,948 20,233  
Provision (Recovery) for loan losses                 2,771 1,254  
Benefit attributable to the FDIC indemnification asset                 1  
Provision (Recovery) for loan losses charged to operations 615 $ 730 $ 934 492 500 $ (1,154) $ 722 1,187 2,771 1,255 2,191
Recovery of loan losses recorded through the FDIC indemnification asset                 (1)  
Ending balance 19,276       17,948       19,276 17,948 20,233
Total allowance                      
Beginning balance       17,948       20,233 17,948 20,233  
Provision (Recovery) for loan losses                 2,771 1,254  
Benefit attributable to the FDIC indemnification asset                 1  
Provision (Recovery) for loan losses charged to operations 615 $ 730 $ 934 492 500 $ (1,154) $ 722 1,187 2,771 1,255 2,191
Recovery of loan losses recorded through the FDIC indemnification asset                 (1)  
Charge-offs                 (2,943) (5,176)  
Recoveries                 1,500 1,637  
Net recoveries (charge-offs)                 (1,443) (3,539)  
Ending balance 19,276       17,948       19,276 17,948 20,233
Receivables Acquired with Deteriorated Credit Quality [Member]                      
Allowance, excluding PCI                      
Beginning balance       12       54 12 54  
Provision (Recovery) for loan losses                 (12) (42)  
Ending balance       12       12 54
PCI allowance                      
Beginning balance       12       54 12 54  
Provision (Recovery) for loan losses                 (12) (42)  
Benefit attributable to the FDIC indemnification asset                 1  
Provision (Recovery) for loan losses charged to operations                 (12) (41)  
Recovery of loan losses recorded through the FDIC indemnification asset                 (1)  
Ending balance       12       12 54
Total allowance                      
Beginning balance       12       54 12 54  
Provision (Recovery) for loan losses                 (12) (42)  
Benefit attributable to the FDIC indemnification asset                 1  
Provision (Recovery) for loan losses charged to operations                 (12) (41)  
Recovery of loan losses recorded through the FDIC indemnification asset                 (1)  
Ending balance       12       12 54
Allowance Excluding Purchased Credit Impaired Loans [Member]                      
Allowance, excluding PCI                      
Beginning balance       17,936       20,179 17,936 20,179  
Provision (Recovery) for loan losses                 2,783 1,296  
Charge-offs                 (2,943) (5,176)  
Recoveries                 1,500 1,637  
Net recoveries (charge-offs)                 (1,443) (3,539)  
Ending balance 19,276       17,936       19,276 17,936 20,179
PCI allowance                      
Beginning balance       17,936       20,179 17,936 20,179  
Provision (Recovery) for loan losses                 2,783 1,296  
Ending balance 19,276       17,936       19,276 17,936 20,179
Total allowance                      
Beginning balance       17,936       20,179 17,936 20,179  
Provision (Recovery) for loan losses                 2,783 1,296  
Charge-offs                 (2,943) (5,176)  
Recoveries                 1,500 1,637  
Net recoveries (charge-offs)                 (1,443) (3,539)  
Ending balance 19,276       17,936       19,276 17,936 20,179
Commercial Portfolio Segment [Member]                      
Allowance, excluding PCI                      
Beginning balance       11,690       13,133 11,690 13,133  
Provision (Recovery) for loan losses                 103 30  
Charge-offs                 (922) (2,392)  
Recoveries                 801 919  
Net recoveries (charge-offs)                 (121) (1,473)  
Ending balance 11,672       11,690       11,672 11,690 13,133
PCI allowance                      
Beginning balance       11,690       13,133 11,690 13,133  
Provision (Recovery) for loan losses                 103 30  
Benefit attributable to the FDIC indemnification asset                  
Provision (Recovery) for loan losses charged to operations                 103 30  
Recovery of loan losses recorded through the FDIC indemnification asset                  
Ending balance 11,672       11,690       11,672 11,690 13,133
Total allowance                      
Beginning balance       11,690       13,133 11,690 13,133  
Provision (Recovery) for loan losses                 103 30  
Benefit attributable to the FDIC indemnification asset                  
Provision (Recovery) for loan losses charged to operations                 103 30  
Recovery of loan losses recorded through the FDIC indemnification asset                  
Charge-offs                 (922) (2,392)  
Recoveries                 801 919  
Net recoveries (charge-offs)                 (121) (1,473)  
Ending balance 11,672       11,690       11,672 11,690 13,133
Commercial Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                      
Allowance, excluding PCI                      
Beginning balance              
Provision (Recovery) for loan losses                  
Ending balance            
PCI allowance                      
Beginning balance              
Provision (Recovery) for loan losses                  
Benefit attributable to the FDIC indemnification asset                  
Provision (Recovery) for loan losses charged to operations                  
Recovery of loan losses recorded through the FDIC indemnification asset                  
Ending balance            
Total allowance                      
Beginning balance              
Provision (Recovery) for loan losses                  
Benefit attributable to the FDIC indemnification asset                  
Provision (Recovery) for loan losses charged to operations                  
Recovery of loan losses recorded through the FDIC indemnification asset                  
Ending balance            
Commercial Portfolio Segment [Member] | Allowance Excluding Purchased Credit Impaired Loans [Member]                      
Allowance, excluding PCI                      
Beginning balance       11,690       13,133 11,690 13,133  
Provision (Recovery) for loan losses                 103 30  
Charge-offs                 (922) (2,392)  
Recoveries                 801 919  
Net recoveries (charge-offs)                 (121) (1,473)  
Ending balance 11,672       11,690       11,672 11,690 13,133
PCI allowance                      
Beginning balance       11,690       13,133 11,690 13,133  
Provision (Recovery) for loan losses                 103 30  
Ending balance 11,672       11,690       11,672 11,690 13,133
Total allowance                      
Beginning balance       11,690       13,133 11,690 13,133  
Provision (Recovery) for loan losses                 103 30  
Charge-offs                 (922) (2,392)  
Recoveries                 801 919  
Net recoveries (charge-offs)                 (121) (1,473)  
Ending balance 11,672       11,690       11,672 11,690 13,133
Consumer Real Estate Portfolio Segment [Member]                      
Allowance, excluding PCI                      
Beginning balance       5,499       6,410 5,499 6,410  
Provision (Recovery) for loan losses                 1,596 343  
Charge-offs                 (699) (1,612)  
Recoveries                 414 358  
Net recoveries (charge-offs)                 (285) (1,254)  
Ending balance 6,810       5,499       6,810 5,499 6,410
PCI allowance                      
Beginning balance       5,499       6,410 5,499 6,410  
Provision (Recovery) for loan losses                 1,596 343  
Benefit attributable to the FDIC indemnification asset                 1  
Provision (Recovery) for loan losses charged to operations                 1,596 344  
Recovery of loan losses recorded through the FDIC indemnification asset                 (1)  
Ending balance 6,810       5,499       6,810 5,499 6,410
Total allowance                      
Beginning balance       5,499       6,410 5,499 6,410  
Provision (Recovery) for loan losses                 1,596 343  
Benefit attributable to the FDIC indemnification asset                 1  
Provision (Recovery) for loan losses charged to operations                 1,596 344  
Recovery of loan losses recorded through the FDIC indemnification asset                 (1)  
Charge-offs                 (699) (1,612)  
Recoveries                 414 358  
Net recoveries (charge-offs)                 (285) (1,254)  
Ending balance 6,810       5,499       6,810 5,499 6,410
Consumer Real Estate Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                      
Allowance, excluding PCI                      
Beginning balance       12       54 12 54  
Provision (Recovery) for loan losses                 (12) (42)  
Ending balance       12       12 54
PCI allowance                      
Beginning balance       12       54 12 54  
Provision (Recovery) for loan losses                 (12) (42)  
Benefit attributable to the FDIC indemnification asset                 1  
Provision (Recovery) for loan losses charged to operations                 (12) (41)  
Recovery of loan losses recorded through the FDIC indemnification asset                 (1)  
Ending balance       12       12 54
Total allowance                      
Beginning balance       12       54 12 54  
Provision (Recovery) for loan losses                 (12) (42)  
Benefit attributable to the FDIC indemnification asset                 1  
Provision (Recovery) for loan losses charged to operations                 (12) (41)  
Recovery of loan losses recorded through the FDIC indemnification asset                 (1)  
Ending balance       12       12 54
Consumer Real Estate Portfolio Segment [Member] | Allowance Excluding Purchased Credit Impaired Loans [Member]                      
Allowance, excluding PCI                      
Beginning balance       5,487       6,356 5,487 6,356  
Provision (Recovery) for loan losses                 1,608 385  
Charge-offs                 (699) (1,612)  
Recoveries                 414 358  
Net recoveries (charge-offs)                 (285) (1,254)  
Ending balance 6,810       5,487       6,810 5,487 6,356
PCI allowance                      
Beginning balance       5,487       6,356 5,487 6,356  
Provision (Recovery) for loan losses                 1,608 385  
Ending balance 6,810       5,487       6,810 5,487 6,356
Total allowance                      
Beginning balance       5,487       6,356 5,487 6,356  
Provision (Recovery) for loan losses                 1,608 385  
Charge-offs                 (699) (1,612)  
Recoveries                 414 358  
Net recoveries (charge-offs)                 (285) (1,254)  
Ending balance 6,810       5,487       6,810 5,487 6,356
Consumer and Other Portfolio Segment [Member]                      
Allowance, excluding PCI                      
Beginning balance       759       690 759 690  
Provision (Recovery) for loan losses                 1,072 881  
Charge-offs                 (1,322) (1,172)  
Recoveries                 285 360  
Net recoveries (charge-offs)                 (1,037) (812)  
Ending balance 794       759       794 759 690
PCI allowance                      
Beginning balance       759       690 759 690  
Provision (Recovery) for loan losses                 1,072 881  
Benefit attributable to the FDIC indemnification asset                  
Provision (Recovery) for loan losses charged to operations                 1,072 881  
Recovery of loan losses recorded through the FDIC indemnification asset                  
Ending balance 794       759       794 759 690
Total allowance                      
Beginning balance       759       690 759 690  
Provision (Recovery) for loan losses                 1,072 881  
Benefit attributable to the FDIC indemnification asset                  
Provision (Recovery) for loan losses charged to operations                 1,072 881  
Recovery of loan losses recorded through the FDIC indemnification asset                  
Charge-offs                 (1,322) (1,172)  
Recoveries                 285 360  
Net recoveries (charge-offs)                 (1,037) (812)  
Ending balance 794       759       794 759 690
Consumer and Other Portfolio Segment [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]                      
Allowance, excluding PCI                      
Beginning balance              
Provision (Recovery) for loan losses                  
Ending balance            
PCI allowance                      
Beginning balance              
Provision (Recovery) for loan losses                  
Benefit attributable to the FDIC indemnification asset                  
Provision (Recovery) for loan losses charged to operations                  
Recovery of loan losses recorded through the FDIC indemnification asset                  
Ending balance            
Total allowance                      
Beginning balance              
Provision (Recovery) for loan losses                  
Benefit attributable to the FDIC indemnification asset                  
Provision (Recovery) for loan losses charged to operations                  
Recovery of loan losses recorded through the FDIC indemnification asset                  
Ending balance            
Consumer and Other Portfolio Segment [Member] | Allowance Excluding Purchased Credit Impaired Loans [Member]                      
Allowance, excluding PCI                      
Beginning balance       759       690 759 690  
Provision (Recovery) for loan losses                 1,072 881  
Charge-offs                 (1,322) (1,172)  
Recoveries                 285 360  
Net recoveries (charge-offs)                 (1,037) (812)  
Ending balance 794       759       794 759 690
PCI allowance                      
Beginning balance       759       690 759 690  
Provision (Recovery) for loan losses                 1,072 881  
Ending balance 794       759       794 759 690
Total allowance                      
Beginning balance       $ 759       $ 690 759 690  
Provision (Recovery) for loan losses                 1,072 881  
Charge-offs                 (1,322) (1,172)  
Recoveries                 285 360  
Net recoveries (charge-offs)                 (1,037) (812)  
Ending balance $ 794       $ 759       $ 794 $ 759 $ 690